Method readFile

deps/v8/tools/zone-stats/trace-file-reader.js:57–119

(file)

  }

  readFile(file) {
    if (!file) {
      this.updateLabel('Failed to load file.');
      return;
    }
    this.$('#fileReader').blur();

    this.section.className = 'loading';
    const reader = new FileReader();

    if (['application/gzip', 'application/x-gzip'].includes(file.type)) {
      reader.onload = (e) => {
        try {
          // Decode data as strings of 64Kb chunks. Bigger chunks may cause
          // parsing failures in Oboe.js.
          const chunkedInflate = new pako.Inflate(
            {to: 'string', chunkSize: 65536}
          );
          let processingState = undefined;
          chunkedInflate.onData = (chunk) => {
            if (processingState === undefined) {
              processingState = this.startProcessing(file, chunk);
            } else {
              processingState.processChunk(chunk);
            }
          };
          chunkedInflate.onEnd = () => {
            if (processingState !== undefined) {
              const result_data = processingState.endProcessing();
              this.processLoadedData(file, result_data);
            }
          };
          console.log("======");
          const textResult = chunkedInflate.push(e.target.result);

          this.section.className = 'success';
          this.$('#fileReader').classList.add('done');
        } catch (err) {
          console.error(err);
          this.section.className = 'failure';
        }
      };
      // Delay the loading a bit to allow for CSS animations to happen.
      setTimeout(() => reader.readAsArrayBuffer(file), 0);
    } else {
      reader.onload = (e) => {
        try {
          // Process the whole file in at once.
          const processingState = this.startProcessing(file, e.target.result);
          const dataModel = processingState.endProcessing();
          this.processLoadedData(file, dataModel);

          this.section.className = 'success';
          this.$('#fileReader').classList.add('done');
        } catch (err) {
          console.error(err);
          this.section.className = 'failure';
        }